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Four fighters from different backgrounds come together to train under an ex MMA rising star and then ultimately have to fight each other and the traitor in their midst.

Raised as a slave, Danny is used to fighting for his survival. In fact, his "master," Bart, thinks of him as a pet and goes as far as leashing him with a collar so they can make money in fight clubs, where Danny is the main contender. When Bart's crew is in a car accident, Danny escapes and meets a blind, kindhearted piano tuner who takes him in and uses music to free the fighter's long-buried heart.

In Los Angeles, an ex-con takes the underground fighting world by storm in his quest to fulfill a promise to a dead friend.

An amateur fighter is lured by a trafficking syndicate specializing in elite underground fighting where her brutal captor forces her to fight or face certain death.

An American Army Major goes AWOL to Hong Kong for an outlawed martial arts contest called the Kumite.

Picking up after the events of Never Back Down 2, former MMA champion Case Walker is on the comeback trail to become champion once again.

When Karate champion Michael Rivers wins the last tournament of his career, shady businessman Ron Hall offers him the opportunity to fight in an illegal Kumite in Bulgaria against the world’s best martial artists. When Michael declines, Hall has his daughter kidnapped and, in order to rescue her, Rivers is left with no choice but to compete in the deadly tournament. Arriving in Bulgaria, he finds out that he is not the only fighter whose loved one was taken. Rivers enlists the help of trainers Master Loren, and Julie Jackson but will it be enough for him to win the tournament and save his daughter’s life?

The eldest son of a ruthlessly tough MMA champion must fight his way out of the abusive cycle his father has continued.

A Chicago cop is caught in the middle of a gang war while his own comrades shun him because he wants to take an irresponsible cop down.

A former fighter reluctantly returns to the life she abandoned in order to help her sister survive the sadistic world of illegal fighting and the maniac who runs it.

Lyon Gaultier is a deserter in the Foreign Legion arriving in the USA entirely hard up. He finds his brother between life and death and his sister-in-law without the money needed to heal her husband and to maintain her child. To earn the money needed, Gaultier decides to take part in some very dangerous clandestine fights.

When a woman's father goes missing, she enlists a local to aid in her search. The pair soon discover that her father has died at the hands of a wealthy sportsman who hunts homeless men as a form of recreation.

In an underground fight club, blackbelt Travis Brickley is killed after losing to the evil martial arts master Brakus. Travis' death is witnessed by Walter Grady, the son of his best friend Alex Grady. Alex and his partner, Tommy Lee, vow to avenge their friend's death by defeating Brakus and shutting down the fight club.

Monroe Hutchens is the heavyweight champion of Sweetwater, a maximum security prison. He was convicted to a life sentence due to a passionate crime. Iceman Chambers is the heavyweight champion, who lost his title due to a rape conviction to ten years in Sweetwater. When these two giants collide in the same prison, they fight against each other disputing who is the real champion.

Ghang-gheng, the ancient winner-take-all competition in which the deadliest fighters from around the world employ the most spectacular feats of martial arts skills ever displayed in order to win the prized Golden Dragon. But fighting prowess alone will not be enough for Chris to triumph over such daunting foes.

Kid is an anonymous young man who ekes out a meager living in an underground fight club where, night after night, wearing a gorilla mask, he is beaten bloody by more popular fighters for cash. After years of suppressed rage, Kid discovers a way to infiltrate the enclave of the city’s sinister elite. As his childhood trauma boils over, his mysteriously scarred hands unleash an explosive campaign of retribution to settle the score with the men who took everything from him.

Retired martial arts world champion Alex Faulkner has settled into a simple life, when the disappearance of two of his students leads to an unthinkable discovery close to home. Just when all hope of finding the children is lost, he locates the imprisoned girls and unsurfaces an international child trafficking operation, which draws him back into the fight of his life against those behind it.

A man must survive a prison where hardened criminals battle to the death for the warden's entertainment.

Canadian policeman Louis Burke is assigned in a jail to investigate the murders of prisoners and jailors. While there, Louis, using his outstanding martial arts skills, is able to save his life and make himself respected in this violent world.

The Bride unwaveringly continues on her roaring rampage of revenge against the band of assassins who had tried to kill her and her unborn child. She visits each of her former associates one-by-one, checking off the victims on her Death List Five until there's nothing left to do … but kill Bill.